You can preview an optimized image in any web browser installed on your system. The browser preview displays the image with a caption listing the image’s file type, pixel dimensions, file size, compression specifications, and other HTML information.
When optimizing an image for the web, consider how the image will appear on different monitors. In general, an image appears darker in Windows systems than on Mac OS systems. You can simulate cross-platform display differences in the Save For Web dialog box.
These preview options adjust color only in the Save For Web dialog box; they don’t change colors in the original or optimized image.
You can preview an animation in the Save For Web dialog box or in a web browser. The Save For Web dialog box shows the animation as still frames. You must preview the animation in a browser to view the frames in timed sequence.